Adds an agent board view, a compact-and-close shortcut for sessions, and live activity for running subagents.
- Optional expandable Board view for the agent dashboard (#57).
- New Retire hotkey compacts and closes a session while keeping its history (#56).
- Resumed sessions whose saved account is unavailable now fall back to Auto instead of failing (#58).
- Running subagents now report their recent tool activity: the dashboard shows what each one is doing,
get_command_or_subagent_outputlists recent steps, and the compaction summary includes each subagent's latest activity (#59).
Thanks to @chrislong365 for #56 and #57.